package collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(2,3));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        System.out.println(c);
        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("c是否包含p"+contains);
        c.remove(p);
        System.out.println(c);

        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);
        System.out.println(pp);
        System.out.println(cc);
        pp.setX(100);
        System.out.println(pp);
        System.out.println(cc);
        System.out.println(c.size());
        c.clear();
        System.out.println(c.isEmpty());




        /*
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        //[元素1.toString(),元素2.toString(),元素3.toString()]
        System.out.println(c);//[(1,2), (3,4), (5,6), (7,8), (9,0), (1,2)]

        boolean contains(Object o):
        判断当前集合是否包含给非给定元素0
        判断依据是给定元素是否与当前集合存在equals（）比较为true的情况

        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("是否包含:"+contains);


        boolean remove(Object o):一般都不接收boolean结果
        从当前集合中删除与给定元素o的equals（）比较为true的元素
        若存在重复元素则只删一次

        c.remove(p);
        System.out.println(c);

        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);
        System.out.println("pp:"+pp);//(1,2)
        System.out.println("cc:"+cc);//[(1,2)]
        pp.setX(100);
        System.out.println("pp:"+pp);//(100,2)
        System.out.println("cc:"+cc);//[(100,2)]

        Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("fore");
        c.add("five");
        //集合重写了Object的toString()方法，返回格式如下
        //[元素.toString()]
        System.out.println(c);

        System.out.println("size:"+c.size());//5 输出集合的元素个数
        //isempty()判断集合是否为空集(size()为0表示空集)
        System.out.println("是否为空集"+c.isEmpty());//false
        c.clear();//清空集合
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size());//0
        System.out.println("是否为空集"+c.isEmpty());//true


         */



    }
}
